As opposed to passwords, which people know are secret[citation needed], links are shared. I mean, Google Drive literally calls it "Sharing", so who will stop sharing after the intended recipients have got it?
Sharepoint and Google drive really feel like they have gone out of their way to make the permissions scheme as convoluted as possible, and it's never clear for me whether I've shared it in a way that permissions can propagate from those I shared it with or not. sometimes I can further share a received Sharepoint document without issue, other times I cannot, and I don't know what the difference is. some of my shared docs that are only shared with specific users can be shared freely apparently, other times when it gets shared further I get automated emails with access requests, even though the public access list is disabled/empty on both cases.
I really wish that the user:group:world wide model was the basis for these permission schemes and it was easier to just set people/groups and the specific actions they can take on a shared file/document. I get why the companies call it sharing, but it shouldn't be thought of as sharing, it should be Grant Access. I think it gives a better mindset for what you're actually doing, and the design should be around the idea you're giving access, not sharing, which is not the same thing to me.
I was rather shocked to learn that the mechanism for creating groups, in the sense of access control, is the Google Groups product, also known as collaborative forums, or one of Usenet's modern homes. And this feature works for individual users as well as Workspaces for Business. I just created a Google Group consisting of my three personal accounts, and I shared a Doc with them!
The three levels of sharing persmissions on Drive are: "View", "Commenter", and "Editor". The second level also permits "editing suggestions" which will prompt the Doc owner to accept or reject. These also have semantics for folders.
And then, there is a little options-gear where you can twiddle additional permissions for certain levels of access. In my personal account, they're permissive by default. Meh.
Because its remaining an issue enables "value extraction". Magic wormhole would work if people knew about it but somehow software that promotes itself by honest word-of-mouth has difficulty competing with software that is bundled with Windows or is made by the world's largest advertising corporation.
There is no release artifact that I can easily open and run on the github page.
To that end you can use a website like https://www.toffeeshare.com/ to send files directly to another person via your browser via a P2P connection, without an account.